McCarthy, Patrick J. and Yan, Haojing and Abraham, Roberto G. and Mentuch, Erin and Glazebrook, Karl and Yan, Lin and Chen, Hsiao-Wen and Persson, S. Eric and Nair, Preethi and Savaglio, Sandra and Crampton, David and Juneau, Stephanie and Le Borgne, Damien and Carlberg, R. G. and Marzke, Ronald O. and Jørgensen, Inger and Roth, Kathy and Murowinski, Richard (2007) A compact cluster of massive red galaxies at a redshift of 1.5. Astrophysical Journal Letters, 664 (1). L17-L21. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20090414-103833164
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We describe a compact cluster or group of massive red galaxies at z = 1.5 discovered in one of the Gemini Deep Deep Survey (GDDS) fields. Deep H-band imaging from the Hubble Space Telescope (HST) reveals a high density of red galaxies associated with a galaxy with a spectroscopic redshift of 1.51. These galaxies have spectral energy distributions (SEDs) that peak between 3.6 and 4.5 μm, and fits to 12-band photometry reveal 12 or more galaxies with spectral shapes consistent with z = 1.5. Most are within ~170 comoving kpc of the GDDS galaxy, and the enclosed stellar mass is >6 × 10^(11) M_☉. The colors of the most massive galaxies are close to those expected from passive evolution of simple stellar populations (SSPs) formed at much higher redshifts. We suggest that several of these galaxies will merge to form a single, very massive galaxy by the present day. This system may represent an example of a short-lived dense group or cluster core typical of the progenitors of massive clusters in the present day and suggests that the red sequence was in place in overdense regions at early times.
|Additional Information:||© 2007 American Astronomical Society. Print publication: Issue 1 (2007 July 20); received 2007 January 26; accepted for publication 2007 June 1 Published 2007 June 28.|
|Subject Keywords:||galaxies: clusters: general; galaxies: evolution|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||06 Aug 2009 20:29|
|Last Modified:||26 Dec 2012 10:57|
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